TW200746050A - Audio signal loudness measurement and modification in the MDCT domain - Google Patents

Audio signal loudness measurement and modification in the MDCT domain

Info

Publication number
TW200746050A
TW200746050A TW096111833A TW96111833A TW200746050A TW 200746050 A TW200746050 A TW 200746050A TW 096111833 A TW096111833 A TW 096111833A TW 96111833 A TW96111833 A TW 96111833A TW 200746050 A TW200746050 A TW 200746050A
Authority
TW
Taiwan
Prior art keywords
audio signal
loudness
frequency band
modification
loudness measurement
Prior art date
Application number
TW096111833A
Other languages
Chinese (zh)
Other versions
TWI417872B (en
Inventor
Alan Jeffrey Seefeldt
Brett Graham Crockett
Michael John Smithers
Original Assignee
Dolby Lab Licensing Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dolby Lab Licensing Corp filed Critical Dolby Lab Licensing Corp
Publication of TW200746050A publication Critical patent/TW200746050A/en
Application granted granted Critical
Publication of TWI417872B publication Critical patent/TWI417872B/en

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
    • G10L25/48—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 specially adapted for particular use
    • G10L25/69—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 specially adapted for particular use for evaluating synthetic or decoded voice signals
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/02—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders
    • G10L19/0212—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders using orthogonal transformation

Abstract

Processing an audio signal represented by the Modified Discrete Cosine Transform (MDCT) of a time-sampled real signal is disclosed in which the loudness of the transformed audio signal is measured, and at least in part in response to the measuring, the loudness of the transformed audio signal is modified. When gain modifying more than one frequency band, the variation or variations in gain from frequency band to frequency band, is smooth. The loudness measurement employs a smoothing time constant commensurate with the integration time of human loudness perception or slower.
TW096111833A 2006-04-04 2007-04-03 Audio signal loudness measurement and modification in the mdct domain TWI417872B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US78952606P 2006-04-04 2006-04-04

Publications (2)

Publication Number Publication Date
TW200746050A true TW200746050A (en) 2007-12-16
TWI417872B TWI417872B (en) 2013-12-01

Family

ID=38293415

Family Applications (1)

Application Number Title Priority Date Filing Date
TW096111833A TWI417872B (en) 2006-04-04 2007-04-03 Audio signal loudness measurement and modification in the mdct domain

Country Status (8)

Country Link
US (1) US8504181B2 (en)
EP (1) EP2002426B1 (en)
JP (1) JP5185254B2 (en)
CN (1) CN101410892B (en)
AT (1) ATE441920T1 (en)
DE (1) DE602007002291D1 (en)
TW (1) TWI417872B (en)
WO (1) WO2007120452A1 (en)

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